This is a note to let you know that I've just added the patch titled
trace/hwlat: Do not start per-cpu thread if it is already running
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
trace-hwlat-do-not-start-per-cpu-thread-if-it-is-already-running.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 08697bca9bbba15f2058fdbd9f970bd5f6a8a2e8 Mon Sep 17 00:00:00 2001
From: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>
Date: Fri, 10 Mar 2023 12:04:51 +0200
Subject: trace/hwlat: Do not start per-cpu thread if it is already running
From: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>
commit 08697bca9bbba15f2058fdbd9f970bd5f6a8a2e8 upstream.
The hwlatd tracer will end up starting multiple per-cpu threads with
the following script:
#!/bin/sh
cd /sys/kernel/debug/tracing
echo 0 > tracing_on
echo hwlat > current_tracer
echo per-cpu > hwlat_detector/mode
echo 100000 > hwlat_detector/width
echo 200000 > hwlat_detector/window
echo 1 > tracing_on
To fix the issue, check if the hwlatd thread for the cpu is already
running, before starting a new one. Along with the previous patch, this
avoids running multiple instances of the same CPU thread on the system.
Link: https://lore.kernel.org/all/20230302113654.2984709-1-tero.kristo@xxxxxxxxxxxxxxx/
Link: https://lkml.kernel.org/r/20230310100451.3948583-3-tero.kristo@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: f46b16520a087 ("trace/hwlat: Implement the per-cpu mode")
Signed-off-by: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>
Acked-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace_hwlat.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -492,6 +492,10 @@ static int start_cpu_kthread(unsigned in
{
struct task_struct *kthread;
+ /* Do not start a new hwlatd thread if it is already running */
+ if (per_cpu(hwlat_per_cpu_data, cpu).kthread)
+ return 0;
+
kthread = kthread_run_on_cpu(kthread_fn, NULL, cpu, "hwlatd/%u");
if (IS_ERR(kthread)) {
pr_err(BANNER "could not start sampling thread\n");
Patches currently in stable-queue which might be from tero.kristo@xxxxxxxxxxxxxxx are
queue-6.2/trace-hwlat-do-not-start-per-cpu-thread-if-it-is-already-running.patch
queue-6.2/trace-hwlat-do-not-wipe-the-contents-of-per-cpu-thread-data.patch
